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Search Publications by: Paul A. Williams (Fed)

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Displaying 101 - 119 of 119

Rotating-polarizer polarimeter for accurate retardance measurement

September 1, 1997
Author(s)
Paul A. Williams, Allen Rose, Chih-Ming Wang
We demonstrate an automated polarimeter based on a rotating polarizer for the measurement oflinear retardance independent oflaser power and detector gain. The retardance is found when a curve is fitted to a unique normalization of the intensity response of

Anomalous relation between time and frequency domain PMD measurements

January 1, 1995
Author(s)
Paul A. Williams, P. R. Hernday
We report nearly simultaneous measurements of polarization mode dispersion (PMD) in various samples of highly mode-coupled single-mode fiber using the measurement methods of Jones matrix eigenanalysis (JME) and Fourier-transformed wavelength scanning. The

Large electroclinic effect in new liquid crystal material

January 1, 1991
Author(s)
Paul A. Williams, M. B. Ros, N. A. Clark, R. T. Vohra, D. M. Walba, M. D. Wand
We report a new liquid crystal material (W317) which has an unusually large electroclinic effect in a phase tentatively identified as smectic A. We show electroclinic tilt angles as large as 21 °, and measurable tilt angles over a 40°C temperature range.

Development of a miniature radiation pressure-measuring microscale

Author(s)
Ivan Ryger, Alexandra B. Artusio-Glimpse, Paul A. Williams, Nathan A. Tomlin, Michelle S. Stephens, Matthew T. Spidell, John H. Lehman
Traditional methods for accurate measurement of high-power lasers involve total absorption of the laser light [1]. Our method, however, measures photon pressure exerted on a mirror without obstruction of the laser beam. The technique enables in situ

Feedback control of a nonlinear electrostatic force transducer

Author(s)
Ivan Ryger, Stefan Chamraz, Richard Balogh, Alexandra B. Artusio-Glimpse, Michelle S. Stephens, John H. Lehman, Paul A. Williams
In this article, we document a design process for a feedback controller for a nonlinear electrostatic transducer that exhibits a strong unloaded resonance. This is being used for precision optical power measurement by means of a photon force measurement
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